Heat and humidity making me sick

If I take showers that are too hot then I become incredibly nauseated and start seeing stars. I never attributed it to my hypothyroidism but it’s worth considering.

I'm the same way with my hypothyroidism, i drive people crazy with how cold i have to be kept, which is weird cuz it says a side effect of hypo is being too cold! don't know if this is normal or related to hypo tho. what i do is keep as many fans on as possible and take cold/warm showers, you get used to it over time and will feel amazing after! hope this helps

Could be POTS

Depends on age and if other conditions are involved.

I also have hypothyroidism and this happens to me... I'm not quite sure how closely the two are related, however.